Coil winding apparatus with integral tension means



H. A. GEORGE Sept. 4, 1956 COIL WINDING APPARATUS WITH INTEGRAL TENSION MEANS Filed Aug. 18, 1955 3o INVENTOR How/mp A. GEORGE United States Patent() COIL WINDING APPARATUS WITH INTEGRAL TENSION MEANS Howard A. George, Oyster Bay, N. Y. Application August 18, 1953, Serial No. 374,887

3 Claims. (Cl. 242-9) This invention relates to tension adjusting means and more particularly to such means for coil winding machines.

In the handling or feeding of wires, for instance in coil winding machines, it is necessary that a constant tension be applied to the wire being wound on the coil form so that the coil may be uniformly, strongly and neatly wound. There will be-frequent changes in tension especially if the coil form is not round but is square or rectangular. If the tension varies erratically the windings on the coil will not be uniformly spaced, and may become very loosely wound and have loops and Crossovers. This problem may be visualized by anyone who has ever` wound a fishingV line by hand about a reel. Furthermore, in the coil winding machine, the feeding apparatus should preferably be moved transversely along the coil form in order to lay the wire on the form in parallel arrangement.

This is especially true in the case of fairly long coil* forms. t

In winding coils of wire, the coil will apply a considerable amount of force to the tensioning device. If the tensioning device is mounted externally to the coil windapparatus being designed so that there is little or no.

force tending to displace the coil winding machine. Since the tensioning device of the present invention is an integral part of the coil winding machine, the various force vectors may be arranged to substantially cancel each other out so that there is a minimum resultant force on the coil winding machine.

and adjusted so that there is no need of very heavy mountings or very heavy components in the apparatus.

Accordingly, a principal object of the invention is to provide new and improved tensioning apparatus for feeding wires and the like.

Another object of the invention is to provide a coil winding machine having integral tensioning apparatus whereby the force vectors, due to the tension of the wires, are confined within the machine so that there is a minimum resultant force tending to displace the machine itself.

Another object of the invention is to provide new and improved coil winding apparatus having tensioning means integral therewith to provide a substantially, completely balanced wire handling system which may be built of light weight components.

Another object of the invention is to provide new and improved coil winding apparatus.

Another object of the invention is to provide new and improved coil winding apparatus including tensioning means which are integral with the coil winding machine Therefore, since the en-` tire apparatus is integral,\it may be accurately balanced Vbodiment of the present invention.

and also adapted to move transversely with respect to the coil form wound.

Another object of the invention is to provide tensioning apparatus for a coil winding machine comprising a mounting bracket, a shaft member having a threaded stud on one end, said stud being adapted to bolt said shaft member to said mounting bracket; a pulley brake member rotatably mounted on said shaft, said shaft being threaded at its other end and a tensioning arm tapped to receive said other threaded end of said shaft member, whereby when the tensioning arm is moved by the tension on the wires it will move along the shaft member and vary the braking pressure against the brake memparent from the following specification and drawings of which:

Figure l is a perspective view of a coil winding machine having transversely mobile tensioning devices.

Figure 2 is a section view of a tensioning device em- A2 and 3 illustrative of the braking operation.

Referring to Figure l, there is shown a coil winding machine mounted on a main bracket 1. The coils to be wound 2, 3 and 4, are mounted on a rotatable shaft 5,

which is adapted to be turned by suitable conventional driving means mounted in the control assembly means 6. The tensioning devices 10, 11 and 12 are mounted on rod members or shafts 13 and 14, which are adapted to move transversely to the coils being wound in a conventional manner. ing the rods 13 and 14 may be entirely conventional and is included in the control box 6. The specific means for moving the rods 13 and 14 transversely may be, for instance, a rack and pinion or screw arrangement or other conventional means. Only one of the rods need be driven since they are clamped together by the tensioning device. The control unit 6 also contains a counter 7, which is connected to count the number of turns applied to the coils.

The tensioning devices themselves, as shown in Figure 2, comprise a mounting bracket 20 which is mounted on the rods 13 and 14 of the coil winding machine. EX- tension arm 21 is fixedly mounted to the mounting bracket 20 by means of the bolts 22 and 23. The extension arm has slots 22 and 23 to provide for an adjustable mounting.

Referring particularly to Figure 4, we will now describe `how the tension arm 24 is operatively connected. A shaft member 25 has a stud connected thereto at one end which is bolted to the mounting bracket 2t) by the nut 26. A pulley 27 preferably of a plastic material such as Bakelite, or equivalent material, is rotatably mounted on the shaft 25. The other end of the shaft member 25 is threaded, the threads 25 having a fairly large pitch and is slotted at the end to provide a screw driver adjustment. The tension arm 24 is tapped and adapted to engage the large pitch threads of the shaft member 25. It will be seen that, as the tension arm is rotated about the shaft member 25 in one direction, it will advance on the shaft and squeeze the plastic pulley member 27 between the tension arm 24 and the mounting bracket 20, thus providing friction braking means for Patented Sept. 4, 1956 The apparatus for transversely mov.

3 controlling Athe tension with the wire. Alternatively, wafers of brake lining material may bewinsertedvgneither side of the pulley whichmay then be of metal.

The wire 30 is fed on to the pulley 27 of the tensioning device and wrapped .around Athe pulleygg27 one or more times, 'then around the guide pulley E,221,mounted at theA free end vof` the `tension arm 1124.4, tthencevargund guide pulley 32 mounted at theffree 'otithiegxtension arn1f2'1 from whichitis applied tothecoi1.2. Aflflgte tension arm absorbs temporaryshoclgs, forinstancewlien the coil form is rectangular.

The operation o'f lthe brake arm isaslfollows:

As the wire is .not ybeing fed fast enough, thecoil 12 Willy eeuee e 'fer'ee Q11 the. tensieuvfarmlft tendine@ tum the teusienerm eeunterseleekuieefAS...the.-tesion turns ,eeuterveleekwse -it will` leasen the -bralsic uusqueeze lthe Epulley :27,` therebvpermittingthe Wire t0 pass' more freely. `.The tension .'arm'L24 .is spring`l ad byspring 28 which tendsto return'tbe tells! 4; in

aclockwise-direction .fon the pui-pose ofdeepiiig .thefwire frvmbeeerning 00 Sleek betweeiJ the .cudelpullevsl andZ. 'Stated .differlently, as the coilZ is rotated, Yit plls the wire 30 off the pulley 32 and ifrthereist v I drag on the wire, the tension arm willrotatefcounterclockwise. against they spring 2,8l pressure .tothe'rebydojosen the 'friction brake comprising the pulley 27 which ,is squeezed betweenvthe mounting bracketlt) and the ,terision arm24. 4

f1`he spring l28 is.mounted on post 33 connected to mounting bracket 2t), and post .34'connectedto-tension arm .-24.asmay be clearlyseen in Figure 3. Figure also Shows how the wire llllis woundaround the pulley 27 and thence around the guide pulleys 31 and 32. vThe wire preferably. has one or. more turns around the pulley 27 audisfled in at a small angle to the plane of the pulley, so-thatit does notrub against itself 'atthe point 36,` Figure 2.

The wire is shown led iin and wound counter-clockwisearound the pulley 27. fltetherefore exerts a clockwise torque on tension arm 24 which bucks the force due to the coil .2 on the tension arm.

If .the Wire30 is wound oppositely on pulley 27, its torque on tension arm 24 will aid the force on arm 24 from coil form 2. .Thismode of operationprovides selfenergizing lbralging .and Apermits `higher speed b ut has v poorer regulation'than thearrangement shown.

lThe tension arm maybe adjusted loosening nut`2r6kand inserting aiscrew driver in 'the slot'39 of studded shaft 2'5. When adjusted the nut 2'6jis again tightened.

`We -will not.'c liscuss force vectors ei'iistingA in 'the tension apparatus. 'There are two vectors (A'& 'B)"'aeting on guide pulley 32, the resultant of which is the vector (A+B) which passes through the Support y ,Shaft i13- Ther'etere, [this resultant vector (A +B)"wi11 not Cause anytwisting'f 'the tension 'device onthe coil winding.A

machine. 'The vectors `(C &"D) acton .the guidepulley lproduing' thegr-esultof vector ('C-HDV) which acts'to provide.aHcounter-clockwise twisting about the shaft' 14. The vectors '(E "&`F) provide a resultant vector (E-FF) whichy acts toI provideaclocltwise moment about the shaft 14.V

,flfhe vectorsf('C,-+D) and (E-l'F) have' been projected adjacent 'shft. .14. 'From this it willV beseen thatif'the vector '(E-l-F) I is somewhat larger than (C -l-D) there wil1"be.a-minimum of twistingvmornenteiterted byethe tension Acleviceon the coil' windingmachine; 'There is 'also'a weight vector W which acts to turn the tensioning auuetetus. eleekvvise about ythe .shaft -1.4 andtassist .the

vector (E-l-F). The weight vector W passes through the shaft 13 and so has no turning moment with respect thereto.

From the foregoing vector analysis, it can be seen that the tensioning device may be designed for a particular application so that there iwillibeno substantially turning force exertedl by .the ,tensioning device .againstthe coil winding machine. Since ,the y.vectoriforces substantially cancel each other vout, an'd the resultant forces may be overcome by relatively small aand .lightweight components,also,the c oil winding machine does nothave to be heavily built'or mountedonvery heavy table or support. It is therefore seen .that.thepresentjnvention is a great advantage over external tensioning devices which are very ditcult to adjust the which must be very securely mounted and also require larger and heavier structural membersf rlfelairu: r

l. A coil winding machine comprising means to rrotatablymountfzat f least one ;coil;;form on :a jrst rotatable shaft, :a pair of shafts a operatively mounted ron-.said :coil winding-machine; and .Tadaptedto be moved transversely to-said first coil .form ,holding'shaft, tension .adiusting meansmounted on 4said,painoiitransversely.'moving shafts, means:responsivetom/ire,4 tension lto .vary-said` tension adjustillg zmeans, said tension ,adjusting -zmeans comprising a `mounting member xed'ly ,connected to f said -pair .of

`tatably;mo.unt at least one Icoil yformen a irstfrotatable shaft, sa .pain of shafts operatively.- mounted on said Coil winding machine ,and iadapted to imove .transYe1Sely to said'firstzcoil; form holding shaft, tension adjusting means mounted on said;pair.;of transverselyimovng .,Shafts, .said tension :apparatus comprises` a. mounting member Xedly connected; to; said pairfof .shaftaaabrake. shaft member bolted to said mounting member, a pulley tot'ktebly mounted -:lon :said .brake shaf t, :said .brake .Shaft bolug threaded'zattits. otheri-endand axtension, arm screwed-.Dn

ftoisaid thrededzend'whereby rotation o fusaiditension armiabout s aiclfbrakefshaftirnemberin one direction will squeeze :said pulley :.betvveen.r saidmounting .bracket .and said tension armfto .tightenflthe pulleyitotherebyconipensate for-zslackness on .theuvire 4f3. Apparatus as:in,:claim.:2-.wh.e11ein ,the 4'Wiremto be wound.Y on. said coil .is-wouud-vonfsaid nulleyfsoaas to :IQ- tate fsaidften'sionsarm -against thezfotoe .due L0 -Sad :coil

form.'

UN-iran. STATES .'-PArENTs 1,515,309 Meissner .ve "Nov.1'l ,l924 jigs-82435 scott Y Ainne 212, i i926 m8615567 1L'eiiiy et-ai. c -J1ny:2s,fm2 @320,264 Chapman "May '25' @1943 

